Paper-folding machine



Dec. 9, 1930.

O KLINSCHMIT PAPER FOLDING MACHINE File NOV. 8, 1929 2 SheetS-Sheet l /ITTOR/VEYS.,A

Dec. 9, 1930. Q KLElNsCHMlT 1,784,731

PAPER FOLDING MACHINE Filed NOV. 8, 1929 2 SheetSl-Sheet 2 HTTOHNEXSI Patented Dec. 9, 1930 i UNITED STATES :PAT-Enf,lorries oscAR xLEInsoHMrr, or LEIPZIG-PLAGWITZ, GERMANY, v.fissreivoa fro GEBRDER BREHMER, MASCHINENFABRIK, oF LEIPZIG-PLAGWITZ, GERMANY PAPER-FOLDING MAGHINE Application filed November 8, 1929, Serial No. 405,804, and in Germany December 13,1928.

In paper folding machines in which the sheets are fed into guides or pockets. for the purpose of producing the first fold by buckling and then folded transversely by means of a knife and folding rollers in order to produce exact cross folds the control of the introduction of the sheets into the folding rollers for the first foldV as well as on to the rollers beneath the knife for effecting the transverse fold and the ejection of the folded sheet in sequence is effected by one complete revolution of the driving shaft. This necessitates a speed of the conveying bands suitable for the largest sheet for which the machine is designed and owing to this fact in the case of the employment of the machine for sheets of comparatively small size, gaps or spaces of a correspond- Y ing size are produced between two consecutive sheets which obviously materially interferes with the obtention of an increased output from the machine when dealing with the smaller sheets of paper to be folded.

The object of the present invention is to eliminate this drawback by providing means whereby the speed of the control shaft mayv be increased at will in accordance with thesize of sheet to be folded without increasingthe speed of the conveying and folding rollers driven from the main shaft.

This may be effected by the nterposition of gearing of any suitable kind of such a nature that whilst the ordinary speed is maintained of the driving shaft and the iirst folding roller, the speed of transmission to the contro-l shaft can be altered to suit theV size of the sheets torbe folded, in such a manner that they are introduced in` close sequence and gaps or spaces'` between the sheets avoided, thus materially increasing the output from the'machine.

In order that the invention maybe clear-V ly understood a simple form o-f constructionV of change speed gear employing cone pulleys is illustrated inA connection with a paper folding machine in the annexed drawings, to which referencewill now be made and in which Y Figure l is a side elevation, Figure 2 a plan, and

` said.

co-operates with Vthe rocking roller e-intermittently at suitable periods fo-r `the introduction of the; sheet between the feed rollers I), c whence it passes into the pocket, f andis folded. by being buckled and passed between the first folding rollers Z) and g.

' At the rear of this buckle folding device may be arranged afsequence of folding. de-` vices according to the number of folds to be made'in agi'ven sheet,.but in the example illustrated in the drawing merely one subsequent fold, orf device Afor making the said fold," is shown.

This consists of the bands L which convey the once folded sheet on tothe transversely arranged rollers z' by which` the second fold is made in the well known manner by the foldthen discharged into the box Y ing knife 7c and Zwhen no further folding is required.

The driving .of the intermittently rocking roller e as well as the folding knife le and of the stacking device in the discharge box Z is effected by means of the control shaft m which is driven by the main shaft o upon the end of which is mounted the belt pulley p that is rotated from any convenient source of power supply, the said shaft also driving the other folding rollers at a constant speed.

Heretofore the main driving shaft 0 has been directly associated with the control shaftV m by vsuitably proportioned toothed wheels. 4Now according to the present invention there is interposed a change speed gear in the form of cone pulleys n n which in themselves are well known. The introduction of these conel pulleys .permits of aconstant speed of rota-v tion of the lshaft o and consequently the whole of the conveying devices and first ,fold mechranism whereas the speed of rotation of the spindle m can bel modiiiedat will according to the variable transmission due to the employment of the cone It will be seen that by the gearing g situated pulley gear n n afore above the main driving shaft 0 the speed of the conveying devices and first fold mechanism is maintained at a constant speed, Whereas by the cone n at the opposite end of the shaft 0 a variable speed may be transmitted to the lay shaft n2 on which thecone pulley n is mounted and through Which by means of the toothed gearing 1" the control shaft m receives its rotatory motion whereby an increased speed of movement to"` the rocking feed roller e is imparted and a corresponding-V ly increased movement imparted to the folding knife v and likewise to the stacking appliance in the discharge box Z.

That I claim is In a paper folding machine, a. main driving shaft, sheet conveying mechanism, a control shaft, variable change speed gearing between the main driving shaft and the Control shaft whereby the speed of the said control shaft may be varied according to the sizeof f the sheet to be folded, buckling folding rollers for receiving the paper and subjecting the same to the first folding operation, a cone l pulley on the main driving shaft whereby a constant speed of rotation is imparted to the sheet conveying mechanism, a lay shaft, and

a cone pulley on the lay shaft coacting With l the first mentioned pulley whereby a variable speed is impart-ed to the control shaft by which the feed, subsequent folding and stacking operations are regulated.

OSCAR KLEINSGHMIT. 

